import java.util.Scanner;


public class Main {
	private static Phonebook choise() {		
		int k;
		System.out.println("What operation do you choose?\n 1. add male\n 2. add female\n 3. find male\n 4. find female");
		Scanner sc = new Scanner(System.in);
		k = sc.nextInt();
		sc.close();
		switch (k) {
		case 1:
			return ;
		case 2:
			return ;
		case 3:
			return ;
		case 4:
			return ;
		default:
			return null;
		}
		return null;
		
	}
	private void findContactByName(){
		
	}
	private void findContactBySurname(){
		
	}
	private void findContactByAge(){
	
	}
	private void findContactByPhone(){
		
	}
	private void findContactByNumberOfFatherhoods(){
		
	}
	private void findContactByNumberOfPregnancies(){
		
	}
	
	public static void main(String[] args) {
		
		
	}


}
